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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99cb5b3cd6aa27e1c6ec433e05583ad9bbb028938a1a4785a10f3e34b6806be5' 
  AND token = 'EnmhXedmb/+eSoz5AYHRi17rdlfJEt7kehSyp4MmyX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}